Dam.



W. L. CHURCH.

DAM.

APPLICATION 111111) 0011s, 1913.

Patented May 26, 1914- HAVEN-FDR: Q M

UNITED STATES PATENT o EIoE. v

WILLIAM L. CHURCH, OF NEWTON, MASSACHUSETTS, ASSIGNOR TO AMBURSEN COMPANY, BOSTON, MASSACHUSETTS, A CORPORATION OF NEW JERSEY.

DAM.

Specification of Letters Patent. Patented May 26, 1914 Application filed October 16, :1913. "Serial No. 795,464.

My invention relates to hollow, reinforced,-

concrete dams of the type described in the patent to Howard L. Coburn, No. 870,934,.

and its object is-to improve the construction of such dams in the manner hereinafter more fully set forth.

One embodiment of my invention is shown .in the drawings accompanying and forming a part of this specification, in which- Figure 1 is a perspective view of a vportion of a dam embodying my invention, and Fig. 2 is a' cross-section of twocontiguous deck beams.

In the particular drawings selected for more fully disclosin my invention, 1 represents a flooring, pre erably of concrete or the like, provided with separated longitudinallyrunning grooves 2, 3, receiving respectively the lower ends of the separately molded concrete beams 5, 6, the beams 5 forming the upstream deck and the beams 6 the downstream deck or apron. These beams preferably are reinforced with metallic rods or other suitable members 12, 13, respectively, embedded in the beams near their under sides to form tension members. The upper end of each beam 6 rests against the ofi-set 7 of its cooperating beam 5 and the upper end of each beam 5 rests against the upper end of its cooperating beam 6 as shown. Where necessary I provide means for tying the upper ends of each pair of beams, and in the present case I show bent rods 10, preferably of metal, the ends of which lie in the grooves 8 and 9 of the beams 5 and 6, respectively.

The grooves formed by rabbetin the longitudinal corners of the upper sur ace of each beam are filled with cementitious material 11, which uniting with the molded beams and surrounding the tie members eflectually bond the severalbeams into a strong unitary structure. The inner portions 4 4 ofthe beam-receiving grooves may, as shown, he filled with cement or the like.

It will be obvious that my improved dam may be built without such forms as are required in constructing the dam descr1bed 1 n the patent above referred to, thereby faclhtating the work and saving a certain amount of expense, more especially as in a dam of the Coburn type, the last set of forms are necessarily inclosed within the dam structure and thereby lost.

The construction above described is appllcable chiefly to dams of the smaller sizes.

It will be understood that various modifications maybe made in the dam hereinbefore particularly described without depart- 1ng from the principle of my invention.

I claim:

1. A hollow dam having its decks formed ofa plurality of pairs of separately molded concrete beams, one member of each pair supporting the other.

2. A hollow dam having its decks formed groovesso formed between adjoining beams.

4. A hollow dam having its decks formed 7 of a plurality of pairs of separately molded concrete beams, one member of each pair supporting the other, the longitudinal cor: ners of the upper surface of each beam being rabbeted, a metallic rod disposed in the grooves so formed between adj|oining beams on the up-st-ream side and adjoining beams on the down-stream side respectively.

25.- A hollow (lam having its decks formed of a plurality of pairs of separately molded concrete beams, one member of each pair supporting the other, the longitudinal corners of the upper surface of each beam being rabbeted, a metallic rod disposed in the grooves so formed between adjolning beams on the up-stream side and ad oining beams on the down-stream side respectively, and cementitious matter in each of said groove for bonding the members of contiguous pairs and inclosing said rod.

6. A hollow dam comprising a flooring provided with two longitudinal grooves, a plurality of separately molded concrete beams arranged in pairs, the lower ends of each pair of beams resting in said grooves, respectively, and the upper ends of each of said pair being supported the one by the subscribedmv name this 15th day of Oct.

other, onejl member of egzh pair of beams be- 1913. ing provi ed with an 0 -set for receiving its coiiperating member, and means for tying WILLIAM CHURCH together the upper ends of each pair of Witnesses: beams. AARON G. DANIELS, In testimony whereof, I have hereunto HOWARD L. COpURN. 

